The Elasto-Gel™ packs vary slightly from the “family of products" as the gel is enclosed in a urethane material. These packs were originally designed for the professional clinical setting when hot water baths were the only source of warming the product. The outside cover must be removed before submerging into water. Due to the urethane cover, a damp cloth must be placed between the patient and the product to provide moist heat. t has been reported that some users, especially in the home setting, prefer to use a microwave for heating. This can be accomplished by carefully removing the urethane material. If this method is preferred, do not submerge the product into water or use a damp cloth between user and product. The gel will produce moist heat or soothing cold without having the urethane cover. See additional product insert for directions for use. The ideal hot/cold therapy: The Elasto-Gel™ Pack can be used for either hot or cold therapy. The pack will provide a dry heat therapy, due to the plastic cover on the gel; however, wet towels may be used underneath the packs to provide a moist heat. The product will hold the heat or cold for 20-40 minutes. A specially formulated gel: This product is made with Elasto-Gel™ a patented* gel with exceptional properties for transferring heat or soothing cold